Backlight not working

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trek5460

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Feb 11, 2013
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Compaq Presario CQ57-339WM Notebook PC System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 32 bit
Processor: Intel(R) Celeron(R) CPU B800 @ 1.50GHz,Intel64 Family 6 Model 42Stepping 7
Processor Count: 2
RAM: 1.85 Mb
Graphics Card: Intel(R) HD Graphics Family, 821 Mb
Hard Drives: C: Total - 286172 MB, Free - 63286 MB; D: Total - 14807 MB, Free -1646 MB; E: Total - 4055 MB, Free - 1108 MB;
Motherboard: Hewlett-Packard, 3672
Antivirus: Computer Security, Updated and Enabled

I cannot get the backlight to light up the screen, I can barely see the display. I have even replaced the screen with new.
The computer runs ok and the VGA output works fine when I hook it up to a monitor.

Thank you
 

dai

Joined
Mar 6, 2003
Messages
11,198
check you have not missed a connection to the screen

replace the backlight if the connections are ok

resolution and backlight type must match

check the hp site for your model service manual
 

trek5460

Thread Starter
Joined
Feb 11, 2013
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3
The backlight is part of the screen. That is why I replaced it. The new screen is the exact part match.
 

dai

Joined
Mar 6, 2003
Messages
11,198
i don't know much about laptops but i seem to remember the led chip connects from the m/board
 

trek5460

Thread Starter
Joined
Feb 11, 2013
Messages
3
Thanks for the idea, but LED screen's do not have inverters that I know of.
 
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